Isolated Gastrocnemius Tightness by CHRISTOPHER W

COPYRIGHT © 2002 BY THE JOURNAL OF BONE AND JOINT SURGERY, INCORPORATED Isolated Gastrocnemius Tightness BY CHRISTOPHER W. DIGIOVANNI, MD, RODERICK KUO, MD, NIRMAL TEJWANI, MD, ROBERT PRICE, MSME, SIGVARD T. HANSEN JR., MD, JOSEPH CZIERNECKI, MD, AND BRUCE J. SANGEORZAN, MD Investigation performed at the Department of Orthopaedics, Harborview Medical Center, and the Seattle Veterans Affairs Medical Center, Seattle, Washington Background: Contracture of the gastrocnemius-soleus complex has well-documented deleterious effects on lower-limb function in spastic or neurologically impaired individuals. There is scarce literature, however, on the existence of isolated gastrocnemius contracture or its impact in otherwise normal patients. We hypothesized that an inability to dorsiflex the ankle due to equinus contracture leads to increased pain in the forefoot and/or midfoot and therefore a population with such pain will have less maximum ankle dorsiflexion than controls. We further postulated that the difference would be present whether the knee was extended or flexed. Methods: This investigation was a prospective comparison of maximal ankle dorsiflexion, as a proxy for gastrocnemius tension, in response to a load applied to the undersurface of the foot in two healthy age, weight, and sex-matched groups. The patient group comprised thirty-four consecutive patients with a diagnosis of meta- tarsalgia or related midfoot and/or forefoot symptoms. The control group consisted of thirty-four individuals without foot or ankle symptoms. The participants were clinically examined for gastrocnemius and soleus contracture and were subsequently assessed for tightness with use of a specially designed electrogoniometer. Measurements were made both with the knee extended (the gastrocnemius under tension) and with the knee flexed (the gastrocnemius relaxed). Results: With the knee fully extended, the average maximal ankle dorsiflexion was 4.5° in the patient group and 13.1° in the control group (p < 0.001). With the knee flexed 90°, the average was 17.9° in the patient group and 22.3° in the control population (p = 0.09). When gastrocnemius contracture was defined as dorsiflexion of ≤5° during knee extension, it was identified in 65% of the patients compared with 24% of the control population. However, when gastrocnemius contracture was defined as dorsiflexion of ≤10°, it was present in 88% and 44%, respectively. When gastrocnemius-soleus contracture was defined as dorsiflexion of ≤10° with the knee in 90° of flexion, it was identified in 29% of the patient group and 15% of the control group. Conclusions: On the average, patients with forefoot and/or midfoot symptoms had less maximum ankle dorsiflexion with the knee extended than did a control population without foot or ankle symptoms. When the knee was flexed 90° to relax the gastrocnemius, this difference was no longer present. Clinical Relevance: These findings support the existence of isolated gastrocnemius contracture in the develop- ment of forefoot and/or midfoot pathology in otherwise healthy people. These data may have implications for preventative and therapeutic care of patients with chronic foot problems. ightness of the gastrocnemius-soleus complex has long first described in the early 1900s by Silfverskiold17 and by been documented in spastic and neurologically im- Vulpius and Stoffel 18, respectively, albeit in spastic patients19-21. paired individuals1-3. Since the first description of To date, even the definition of and method of examining for T 4 tendo Achillis lengthening in the early 1800s by Delpech , re- equinus contracture remain controversial, with the maximal lease or attenuation of the superficial posterior compartment ankle dorsiflexion values used as a measure of equinus defor- of the leg has been performed in many ways to relieve equinus mity ranging from 0° to 25° and the examination performed contracture and to improve gait and muscle balance across the with the knee in varying amounts of flexion or extension22-28. foot and ankle5-16. Very little attention, however, has been paid As a result of such confusion, the reliability of clinical exami- to the cumulative pathological effects or even the existence of nation for correctly identifying contracture also has never a more subtle equinus contracture of the gastrocnemius that been determined. can be found in the “normal,” otherwise unaffected popula- Except for a few still controversial examples of plantar tion. This is surprising considering that isolated gastrocne- fasciitis, forefoot ulceration in diabetics, or progressive hallux mius tightness and its treatment with surgical recession were valgus or flatfoot, the relationship between tightness of the su- Downloaded From: http://jbjs.org/ by a UNIVERSITY OF WASHINGTON User on 03/05/2014 THE JOURNAL OF BONE & JOINT SURGERY · JBJS.ORG ISOLATED GASTROCNEMIUS TIGHTNESS VOLUME 84-A · NUMBER 6 · JUNE 2002 perficial posterior compartment and progressive pathological the study and, if they were, to sign an informed-consent form. changes in the foot in non-spastic individuals has been over- looked entirely by the orthopaedic community26,29-32. In contra- Clinical and Radiographic Examination distinction, more attention has been paid to this phenomenon A brief medical and surgical history was obtained from each in the podiatric literature over the past three decades, although individual to be studied, and a directed physical examination most of those reports are observational or anecdotal10,23,28,33-38. of both feet and ankles was performed. The patient’s height We know of no paper specifically addressing the prevalence of and weight, any previous treatments, and all medications isolated gastrocnemius contracture or its long-term effects in were recorded. Any history of smoking, diabetes, or ligamen- otherwise normal, healthy people. tous laxity (defined as elbow hyperextension) was also noted. Our experience has suggested that the gastrocnemius Examination was performed to identify any physical or struc- muscle in particular is the predominant deforming force in tural foot or ankle abnormalities, with attention paid to the people with structural breakdown or chronic pathological chief symptom. A subjective clinical assessment of the pres- changes related to the foot and ankle. We suspect that con- ence or absence of equinus was then made by the examiner. tracture of this muscle is not only common but often partially Gastrocnemius contracture was simply recorded as “present” responsible for many of the chronic forefoot and midfoot or “absent” by the examiner on the basis of the Silfverskiold symptoms identified in non-neurologically impaired patients. test17. Weight-bearing anteroposterior, lateral, and oblique The purpose of our study was to identify the prevalence of radiographs of the foot and/or ankle were not routinely made equinus contracture in a group of individuals with and with- for the purposes of this study, but any that had been made out foot symptoms, with a specific focus on the presence of incidentally during a patient’s clinic visit were evaluated. No isolated gastrocnemius tightness and our ability to accurately diagnose it. We hypothesized that an inability to dorsiflex the ankle as a result of equinus contracture leads to increased pain in the forefoot and/or midfoot and therefore a population with such pain will have less maximal ankle dorsiflexion than controls. We further postulated that the difference would be present whether the knee was extended or flexed. Materials and Methods Patient Enrollment ubsequent to obtaining Institutional Review Board ap- Sproval, we prospectively identified sixty-eight subjects for this investigation between April 1, 1999, and July 31, 1999. The patient population comprised thirty-four consecutive patients who presented to our University and Veteran’s Adminis- tration foot and ankle clinics because of isolated forefoot or midfoot pain of any duration. The exclusion criteria for the approximately 1000 patients screened for this group included any history of neurological disease including neuroma, any systemic disease potentially affecting the foot or ankle such as the vasculitides or rheumatoid arthritis, any confounding pre- existing foot or ankle surgery or trauma, any osseous block to ankle dorsiflexion, or any irreducible foot deformity (i.e., one making it impossible to obtain a neutrally aligned foot by re- ducing the talonavicular joint) precluding proper testing and evaluation of ankle equinus. Individuals with symptoms related solely to the hindfoot or ankle, those with severe hindfoot deformity, and those with midfoot pain suspected to be the result of ankle or hindfoot pathology were also excluded. Fig. 1 The control population consisted of thirty-four randomly The equinometer comprises an electrogoniometer (A) attached to the lat- identified spouses of patients or hospital personnel from mul- eral aspect of the leg by means of a four-bar linkage (B), which is con- tiple services who had no foot or ankle symptoms. Approxi- nected to a rigid foot-plate attached underneath the foot with a force mately seventy-five people were interviewed for inclusion in transducer (C) positioned beneath the second metatarsal head. The an- the control group before a sufficient number who met the ex- kle acts as the center of rotation for an upwardly applied force to the clusion criteria described above could be enrolled. All people plantar surface of the foot. Resultant maximal ankle dorsiflexion is mea- fulfilling

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